182
6 Construction of the Names of Complex Compounds
OH
eOOH
Me
8-Hydroxy -4,5-dimethylazulene-2-carboxylic acid (4.5.8)
not: 4-Hydroxy-7 ,8-dimethylazulene-2carboxylic acid (4.7.8)
£) lowest locant for the (alphabetically) first cited prefix substituent.
1-Methyl-4-nitro naphthalene but
1-Nitro-4-propylnaphthalene
6.5
Order of Prefixes
As follows from the preceding chapters, prefixes of the most diverse meaning play an often decisive role in the systematization of compound names.
It is therefore necessary to regulate more or less strictly the ordering of
these prefixes in constructing a systematic name.
All prefixes encoding explicit statements about the structure of a pertinent acyclic or cyclic parent system are incorporated into the stem terms,
i. e. treated as non-detachable parts of a name.
Non-detachable prefixes for parent systems:
a) ring-forming: cyclo, bicyclo etc., spiro etc.,
b) ring-cleaving: seco (see steroid nomenclature, Table 22),
c) size-changing: nor, homo (Table 22),
d) fusing: benzo, cycloocta, imidazo etc.,
e) "a" terms of replacement nomenclature: oxa, phospha, azonia, etc.,
£) isomerizing: iso, sec, tert,
g) hydrogen-indicating,
h) bridge-forming: etheno, benzeno etc.
In contrast, all substitutive prefixes (Tables 6,8) are treated as detachable
and ordered alphabetically.
6 Construction of the Names of Complex Compounds
OH
eOOH
Me
8-Hydroxy -4,5-dimethylazulene-2-carboxylic acid (4.5.8)
not: 4-Hydroxy-7 ,8-dimethylazulene-2carboxylic acid (4.7.8)
£) lowest locant for the (alphabetically) first cited prefix substituent.
1-Methyl-4-nitro naphthalene but
1-Nitro-4-propylnaphthalene
6.5
Order of Prefixes
As follows from the preceding chapters, prefixes of the most diverse meaning play an often decisive role in the systematization of compound names.
It is therefore necessary to regulate more or less strictly the ordering of
these prefixes in constructing a systematic name.
All prefixes encoding explicit statements about the structure of a pertinent acyclic or cyclic parent system are incorporated into the stem terms,
i. e. treated as non-detachable parts of a name.
Non-detachable prefixes for parent systems:
a) ring-forming: cyclo, bicyclo etc., spiro etc.,
b) ring-cleaving: seco (see steroid nomenclature, Table 22),
c) size-changing: nor, homo (Table 22),
d) fusing: benzo, cycloocta, imidazo etc.,
e) "a" terms of replacement nomenclature: oxa, phospha, azonia, etc.,
£) isomerizing: iso, sec, tert,
g) hydrogen-indicating,
h) bridge-forming: etheno, benzeno etc.
In contrast, all substitutive prefixes (Tables 6,8) are treated as detachable
and ordered alphabetically.